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Clin Exp Optom. 2015 Jul;98(4):359-61. doi: 10.1111/cxo.12278. Epub 2015 May 5.

Measurement of amplitude of accommodation in young persons.

Author information

1
Department of ophthalmology, National Medical Academy of Postgraduate Education, Kiev, Ukraine. nmsmicro@gmail.com.
2
Department of ophthalmology, National Medical Academy of Postgraduate Education, Kiev, Ukraine.

Abstract

BACKGROUND:

The aim was to evaluate the amplitude of accommodation using test objects designed with constant angular size corresponding to 6/6 visual acuity.

METHODS:

In total, 155 young volunteers with good ocular and systemic health aged between eight and 25 years were recruited for the study. A push-up method was conducted, with the near-vision target having a set of Landolt's broken circles. The angular size of the circles corresponded to a 6/6 visual acuity for various distances from 5.0 cm to 40 cm. To ensure precision of the object size, the electron beam lithographic technique was applied.

RESULTS:

A general trend in a reduction in amplitude with the progression of age is coincident with data from previous studies; however, the magnitudes of the volume of accommodation in our study are substantially lower.

CONCLUSION:

Test objects with constant angular size can increase the accuracy of 'push-up' accommodation measures.

KEYWORDS:

constant size target; near point of clear vision; near-vision charts; proximeter; push-up method; volume of accommodation

PMID:
25943895
DOI:
10.1111/cxo.12278
[Indexed for MEDLINE]
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